Marcel purchasing a board to build a bookcase. he want to divide the bookcase into 1.75-foot sections. he needs six sections what size board does marcel need.

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

4 + 5 7/9= 9 7/9

step-by-step explanation: